Subject: RE: [vhdl-200x-mp] Analog/Digital conversion
From: Peter Ashenden (peter@ashenden.com.au)
Date: Tue May 06 2003 - 17:50:17 PDT
Paul,
> I was under the impression that VHDL-AMS had the equivalent of
> conversion modules, but it's been several years since I looked at the
> language in detail. Peter Ashenden may wish to comment....
VHDL-AMS as it currently stands does not have conversion modules. Thus, you
cannot associate a (converted) quantity as an actual for a signal port, or
vice versa.
The 1076.1 working group was considering adding such a feature, but I'm not
aware of them having followed through with the detailed language design.
(Too much to do and not enough time/people to do it!)
If we're heading toward developing a feature in this group, we should talk
to the VHDL-AMS people who have already given it some thought. I recall
Ernst Christen and Ken Bakalar were involved some time ago. I'm afraid I
haven't been following this thread closely, since I'm working on another
project this week. If it's still relevant later next week, I'll try to find
some cycles...
Cheers,
PA
-- Dr. Peter J. Ashenden peter@ashenden.com.au Ashenden Designs Pty. Ltd. www.ashenden.com.au PO Box 640 Ph: +61 8 8339 7532 Stirling, SA 5152 Fax: +61 8 8339 2616 Australia Mobile: +61 414 70 9106> -----Original Message----- > From: Paul J. Menchini [mailto:mench@mench.com] > Sent: Tuesday, 6 May 2003 10:09 > To: Kevin Cameron x3251 > Cc: mench@mench.com; vhdl-200x-mp@eda.org; Peter J. Ashenden > Subject: Re: [vhdl-200x-mp] Analog/Digital conversion > > > Kevin, > > >> Are the facilities of VHDL-AMS insufficient? > > > Since VHDL-AMS doesn't provide access to driver waveforms or > > "conversion modules" I'd say it's insufficient, but I don't > think it's > > particularly difficult to add that functionality. > > > > BTW, is my understanding that VHDL does hierarchical signal > resolution > > correct (a signal is resolved locally and the result passed up, and > > the effective value propagated back from the top)? > > Signal resolution occurs at each level in the hierarchy where a signal > in the net is of a resolved type. Driving values are > propagated upwards > to the root signal. The driving value of the root signal becomes its > effective value, and that effective value is then propagated > down to the > leaves. > > Paul >
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